Rotary print press including a device for punching rows of perforations in continuous paper webs

ABSTRACT

The perforation punching is effected by rotary punching tools secured to driving shafts and including a first tool provided with readjustable punch pins mounted in a receiving body and a cooperating second tool provided with punch dies. The punch pins are regrindable by a grinding attachment, to tangency of their working ends with a common circle concentric with the axis of rotation of the first tool. The grinding attachment is mounted adjustably on the machine frame and permits regrinding the pins without removing the tool from its working position. The pin resetting device is mounted in the receiving body coaxial with the driving shaft of the first tool and acts simultaneously on all of the pins. The resetting device is actuable, for rotation, by an actuating means which is externally accessible. In one embodiment, the pins are of equal length and have oblique inner ends which are resiliently biased against a conical ring which can be moved axially by a gear wheel threadedly engaged with the receiving body and rotated by a pinion which, in turn, has an externally accessible drive shaft. In another embodiment, the pins are of unequal and gradually increasing length, and their inner ends engage the spiral periphery of a member rotatably mounted in the receiving body and having a gear hub engageable with an actuating pinion which may be rotated from the exterior of the machine.

United States Patent [1 1 Brandt et al.

[ Sept. 3, 1974 ROTARY PRINT PRESS INCLUDING A DEVICE FOR PUNCIIING ROWSOF PERFORATIONS IN CONTINUOUS PAPER WEISS [75] Inventors: EckhardBrandt; Otto Staaman,

both of Berlin, Germany [73] Assignee: Firma AutomaticDruckmaschinenfabrik Dr. W. Hinniger und Sohne, Berlin, Germany 221Filed: Ju1y10,1973

21 Appl. No; 377,898

[30] Foreign Application Priority Data July 14, 1972 Germany 2235511[52] US. Cl 83/174, 83/345, 83/677 [51] Int. Cl B26f 1/10, B26d 7/12[58] Field of Search 83/677, 345, 700, 174

[56] References Cited UNITED STATES PATENTS 3,192,810 7/1965 Amato83/174 Primary Examiner.l. M. Meister Attorney, Agent, or FirmMcGlew andTuttle [5 7 ABSTRACT The perforation punching is effected by rotarypunching tools secured to driving shafts and including a first toolprovided with readjustable punch pins mounted in a receiving body and acooperating second tool provided with punch dies. The punch pins areregrindable by a grinding attachment, to tangency of their working endswith a common circle concentric with the axis of rotation of the firsttool. The grinding attachment is mounted adjustably on the machine frameand permits regrinding the pins without removing the tool from itsworking position. The pin resetting device is mounted in the receivingbody coaxial with the driving shaft of the first tool and actssimultaneously on all of the pins. The resetting device is actuable, forrotation, by an actuating means which is externally accessible. In oneembodiment, the pins are of equal length and have oblique inner endswhich are resiliently biased against a conical ring which can be movedaxially by a gear wheel threadedly engaged with the receiving body androtated by a pinion which, in turn, has an externally accessible driveshaft. In another embodiment, the

10 Claims, 10 Drawing Figures PATENTEU SEP 3 574 SHEET 3 BF 4 ROTARYPRINT PRESS INCLUDING A DEVICE FOR PUNCI-IING ROWS OF PERFORATIONS INCONTINUOUS PAPER WEBS FIELD AND BACKGROUND OF THE INVENTION Thisinvention relates to rotary printing presses having devices for punchingrows of perforations in continous webs, the devices being in the form ofrotary punching tools secured to driving shafts and including a firsttool provided with readjustable punch pins mounted in a receiving bodyand a second tool provided with punch dies, and, more particularly, tosuch a rotary printing press in which all the pins may be radiallyadjusted simultaneously and may be re-ground so that their outer endsare tangent to a common circle concentric with the axis of rotation ofthe first tool, by means of a grinding attachment adjustably mounted onthe machine frame.

Up to the present, rotary perforation punching tools, used in rotaryprinting presses, are of the type in which each individual pin of anupper tool is clamped in a respective bore of the receiving body by ascrew, from the front side. After a certain service time, the pins areworn down to the extent that it is no longer possible to obtain uniformperforations. To reset the tool, it has been necessary individually torelease each pin, readjust its protruding length, and to clamp the pinin position again. This work still occurs outside the rotary press.Thus, for resetting, the upper tool must be removed from the shaft and,at a suitable working place, each pin must be reset to obtain a lengthas accurate as possible and to be reground on a separate machine.However, because the printer is in no way familiar with the metalremoving work and also does not possess any machine tools, it has beenusual to hand over the reset upper tool to a grinder who effects thegrinding ofthe pins on the grinding machine available at anotherlocation. It is only thereafter that the upper tool can be remountedinto the rotary press.

This necessary sequence of working operations is extremelytime-consuming, and also the rotary press is out of service during theworking operations. The loss of working hours resulting from theoperation is frequently very high.

It is indispensable, for the mentioned sequence of adjusting operations,first to reset the length of the worn pin and only then to proceed withthe grinding. An attempt to reset the centrical working outer line ofthe tool by regrinding the worn pins without a previous resetting wouldinevitably result in a loss of the piercing effect, because the distancebetween the axes of the upper and lower tools in the rotary press is setand unchangeable.

SUMMARY OF THE INVENTION LII The present invention is directed to theproblem of press and which furthermore is capable of displacing the pinsradially by equal distances, and by mounting the grinding device on across beam of the frame of the rotary press, the cup wheel of thegrinding device being adjustable to the reset pins of the upper toolwhile the latter remains in its working position.

The invention makes it possible to reset all of the pins of a punchingtool simultaneously by the same distance without removing the tool fromthe rotary press, and thereafter immediately to regrind the reset pinsto accurate tangency of their outer or working ends with a common circleconcentric with the axis of rotation of the tool. Both the resettingoperation and the regrinding operation may be performed in a very briefperiod of time and, for the grinding, there may be utilized the drivingmechanism already provided in the press for the punching tools, so asmerely to run the machine at a lower speed and without the paper webtherein. In comparison with the hitherto necessary removal operation,the accuracy of the grinding is improved because the upper tool to bereground remains on its shaft in its working position. The grinding cupwheel is driven separately, and need only be adjusted to the exactdiameter of the punching tool,.that is, to the exact diameter of thecommon circle concentric with the axis of rotation of the tool. Areciprocating movement of the grinding cup wheel during grinding is notnecessary, because the cup does not produce tooling marks.

Advantageously, grits and ground way material are evacuated through anauxiliary nozzle connected to a suction or exhaust device which isalready provided on the rotary press for removing the perforation waste.

In one embodiment of a resetting device in accordance with theinvention, mounted in the receiving body of the upper tool, thereceiving body comprises a hub having an external thread, and a gearhaving a corresponding intemal thread is screwed on to the externalthread, the gear being provided with a hub bearing a conical ring, whichis fixed against axial displacement relative to the gear, and which hasa conical surface against which rests the inner ends of pins havingequal lengths. The inner ends of the pins are provided withcorresponding oblique surfaces and subjected to the bias of compressionsprings. The gear meshes with an axially fixed rotatable adjustingpinion mounted in the receiving body, and secured to a shaft whichconstitutes an externally accessible actuating means.

In the first embodiment of the resetting device, the pins are alwaysequal in length and remain in the tool until all the pins are entirelyused up. The maximum resetting is effected by biasing the inner ends ofthe pins against the conical surface in the zone of its maximumdiameter. The adjustment resetting path of the conical ring is limitedby a stop screw cooperating with the gear and secured by a lock nut.When the gear is moved in the opposite direction, all of the pins areretracted uniformly into the receiving body, under the spring bias.Thus, the resetting device permits putting an upper tool,'equipped withperforation pins, out of operation, so that it will not perform anyperforating operation. In this case, also, the resetting device makes itunnecessary to remove a punching tool from its shaft when it is not tobe used.

To obtain the possibility of easy resetting of the pins of the punchingtool in any working position of the latter, it is advantageous toprovide two equivalent adjusting pinions at diametrically opposedlocations, where they may be actuated selectively by means of squaredends on the respective shafts.

In another embodiment of the resetting device, the receiving body hasassociated therewith a disc having a spiral external periphery with aregular gradient, and which is mounted on the hub of a covering flangeand provided with another hub in the form of a gear. Pins of graduallydifferent lengths and overall cylindrical shape are biased against thespiral peripheral surface of the disc. The uniformlygraduated lengthdifferences of the pins are equal to one another, and correspond to thespacing of the pins on the receiving body as well as to the gradient ofthe spiral. A clamping mechanism is associated with each pin and thegear is engaged with an adjusting pinion which is mounted in thereceiving body so as to be restrained against axial movement, and havinga shaft provided with actuating means accessible from the exterior ofthe press.

As compared to the first embodiment, the second embodiment of theresetting device has the advantage that, of all the pins, in each caseonly the shortest one is replaced as soon as its resetting length isused up. After releasing the clamping mechanism, such a pin can easilybe removed from its reception bore, and, after turning the disc throughone pitch, the worn pin can be replaced by a new pin which then will bethe longest pin.

With respect to the clamping mechanism, it is advantageous to provide,transversely of the reception bore of each pin, a larger bore partiallyintersecting the reception bore and receiving a tapered locking boltwhose oblique surface, in the clamping position, engages the pin owingto the pressure of disc springs which are mounted on the bottom of thelarger bore at the rear end surface thereof. On the front portion of thebore, a tapped bore is provided coaxial with the larger bore, and aback-pressure screw may be threaded into the tapped bore to release theclamping of the pin. To accomplish resetting, it is sufficient to screwin the back-pressure screw at the location corresponding to the shortestworn pin, and that only for the time necessary to loosen the pin andreplace it by a new one. Thus, the back-pressure screw is only anauxiliary tool which is removed immediately after a pin has beenreplaced.

An object of the invention is to provide, in a rotary printing press, animproved device for punching rows of perforation in continuous paperwebs.

Another object of the invention is to provide such a device in whichpunching pins may be reset and reground without removal of a supportingbody from the press.

A further object of the invention is to provide such a device in whichthe down time" for resetting and regrinding the punching pin is reducedto a minimum and is very considerably less than that presently required.

Another object of the invention is to provide such a device in which allof the pins can be simultaneously reset through the same radial distanceby actuating means accessible from the exterior of the printing press.

For an understanding of the principles of the invention, reference ismade to the following description of typical embodiments thereof asillustrated in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS In the Drawings:

FIG. 1 is a simplified schematic representation of a rotary printingpress including an adjustable upper tool of a punching device and agrinding attachment mounted above the tool;

FIG. 2 is an enlarged view, partly in section, illustrating the punchingtools and the grinding attachment of FIG. 1 in greater detail;

FIG. 3 is a top plan view of the grinding attachment and correspondingto FIG. 2',

FIG. 4 is an end elevation view of a first embodiment of the resettingdevice and the upper tool, as shown in FIG. 2;

FIG. 5 is a cross-sectional view, taken along the line V-V of FIG. 4,with the pins being in working position;

FIG. 6 is a similar view with the working and retracted position;

FIG. 7 is an end elevation view, partly broken away, of anotherembodiment of the resetting device shown in FIG. 2;

FIG. 8 is an enlarged cross-sectional view taken along the lineVIII-VIII of FIG. 7;

FIG. 9 is an enlargedsectional view illustrating the pin clamping meansof FIG. 8 with the pins in their working positions; and

FIG. 10 is a view similar to FIG. 9, but illustrating the pins asreleased.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, the rotarypress illustrated therein operates on a roll 1 of paper from which thereis drawn a web 2 which passes through printing units 3, a forwardingmechanism 4, three perforators 5, and a set of punching tools 6 to thedelivery 7. Punching tools 6 include an upper tool 8 and a lower tool 9both carried by respective driving shafts mounted in frame 10 of themachine. Upper tool 8 is provided with punching pins 11, and lower tool9 is provided with the corresponding number of. punching dies 12. Thegrinding atpins being in a nontachment, generally designated at 13, isprovided above upper tool 8 and is equipped with a cup grinding wheel 14rotatable about a vertical axis.

As best seen in FIGS. 2 and 3, grinding attachment 13 is mountedadjustably on the cross beam 15 of machine frame 10, by means of a slide16 which can be clamped in its adjusted position by clamping screws 17operated by levers 18. Slide 16' supports a column 19 serving as a guidefor a vertically adjustable carriage 20 and, for adjusting carriage 20,an axially fixed spindle is mounted on column 19 and is threadedlyengaged in an internal thread of carriage 20. Carriage 20 supports thebracket 22 and a motor 23 driving the spindle 25 of a cup wheel 14through the medium of a V-belt and pulley arrangement 24. Grinding face26 of cup grinding wheel 14 is adjustable to the regrinding diameter Dof pins 11 and to any upper tool 8 because, by virtue of its mounting oncross beam 15, it may be brought into any desired position.

Upper and lower tools 8 and 9 punch or pierce rows of perforations 27into web 2. The axialspacing of the punching tools on their shaft isadjustable. FIG. 3 illustrates how upper tools 8 are mounted on theirdriving shaft 28. Shaft 28 is formed with a longitudinal keyway orgroove 29 receiving keys which have not been shown in FIG. 3. To securethe two tools at a spacing corresponding to the spacing of the desiredperforations 27, respective screws 30 are tightened against the keys.Lower tools 9 are secured to their driving shafts in an inanalogousmanner.

Perforating or punching pins 11 inserted in upper tool 8 may be regroundwhile tool 8 remains in its working position in the rotary press. Thegrits and the like from the regrinding operation are evacuated to asuction head 31 connected through a flexible pipe 33 to an exhauster 32,as shown in FIG. 1. Such an exhauster or suction device is usuallyprovided, in any case, for removing paper shavings and the like and isdriven by an electric motor 34.

FIGS. 4, 5, and 6 illustrate a first embodiment comprising a resettingdevice 34 mounted in upper tool 8 which is equipped with pins 11. Uppertool Sis secured to its drive shaft 28 by means of a clamping screw 36,corresponding to the clamping screw 30 of FIG. 3, and bearing against akey 37 inserted into a longitudinal groove 38 corresponding to groove 29of FIG. 3.

Tool 8 comprises a receiving body 39 including a hub 41 which isexternally threaded. A gear 32 is internally threaded to engage thethreaded hub 41, and is provided with a hub 43 bearing a conical ring 44which is fixed against axial movement by a shoulder of hub 41 and by asnap ring 45, so that conical ring 44 is fixed against axial movementrelative to gear 42. The inner ends of pins 11 are provided with heads47 having oblique contact surfaces corresponding to the conical surface46 of ring 44, and biased against the conical surface by compressionsprings 48, which are preferably disc springs. Through gear 42, conicalring 44 is adjustable axially by rotation of a pinion 49 which ismounted in receiving body 39 in an axially fixed position. To retainpinion 49 against axial displacement, a set screw 50 engages in anacute-angled circular groove 51 of the pinion shaft. The pinion shaftterminates in a square outer end 52 which is externally accessible toactuate pinion 49 and, thus, to actuate resetting device 34.

A stop screw 53 in association with a lock nut 54 is threadedinto'receiving body 39 and directed into engagement with gear 42 fordefining the resetting range of gear 42 and conical ring 44. In theopposite direction, the resetting range of gear 42 and ring 44 islimited by an annular stop 55 secured to the left-hand frontal surface,as shown in FIGS. 5 and 6, of hub 41.

In this embodiment of the invention, all the pins 11 have the samelength. In their working position, the pins protrude from the peripheryof receiving body 39 in accordance with the setting effected by thepinion 49, as shown in FIG. 5. The protrusion of the pins is limited bythe end position of gear 42 as set by screw 53in lock nut 54. In thisextreme position, the pins are ground exactly to the desired diameter ofthe working circle of the outer end of the pins, by means of thegrinding attachment described above.

To retract pins 11 from their working position, gear wheel 52 is movedaway from stop screw 53 whereby the pin heads 47 under the bias ofsprings 48, slide to the smallerdiameter portion of conical ring 44until, in the opposite end position, the gear 42, the pins occupy theretracted position shown in FIG. 6.

As indicated in FIG. 4, two adjusting pinions 49 may be provided atdiametrically opposite locations, in

order to permit a resetting of pins 11 practically in any workingposition of upper tool 8 of the press.

FIGS. 7, 8, 9 and 10 illustrate the second embodiment of the inventioncomprising a resetting device generally designated 35a. This embodimentof the invention differs from that already described above insofar aspins 11a are of unequal, progressively increasing length and bearagainst a regularly sloping circumferential surface 56a of aspiral-shaped disc 56. Disc 56 is carried by a hub designed as a gear 57and which meshes with an adjusting pinion 49a which is mounted inreceiving body 39a so as to be fixed against axial displacement. Thefixing may be the same as that described for FIGS. 4 and 5. By means ofbolts 58, receiving body 39a is fixedly screwed to a flange 59 of a hub60 which is secured to shaft 28 by the clamping screw 36a engaging thekey.

The smooth cylindrical pins 11a are inserted from the outside intoreception bores 61 and are clamped in their respective position. To thisend, there are provided tapered clamping or binding bolts 62 each havingan oblique surface 63 and guided in a respective larger diameter 64which is machined transversely of the associated reception bore 61 andat least partially intersects the latter. Bolts 62 seat against discsprings 65 which absorb the clamping force applied against the insertedpins 11a. A tap hole 68, for a back-pressure screw 67, extends from theoutside into bore 61.

In the zone of the abrupt change in diameter of spiral surface 560, atthe location indicated by 66 in FIG. 7, the shortest pin which hasalready been worn down, is replaced by a new one. For this purpose, andas shown in FIG. 10, back-pressure screw 67 is screwed into tap hole 68of the used pin until the associated tapered binding bolt 62 is releasedand the pin can be removed. Thereupon, spiral-shaped disc 56 is turnedby one pitch in the direction of arrow 69 of FIG. 7 by correspondinglyturning adjusting pinion 49a which may be actuated through an internalhexagonal socket head 52a. A new pin 11a is then inserted into thecleared reception bore 61, and has the initial normal length. Thereafterback-pressure screw 67 is screwed out of tap hole 68 so that the newlyinserted pin is clamped in its position by the bolt 62. In turning thespiral surface through one pitch, all of the pins are reset and they aresubsequently ground to the desired working circle.

In this second embodiment of the invention, two or more adjusting pinsmay be provided in the same manner as mentioned for the firstembodiment, to facilitate resetting of the spiral surface. The secondembodiment of the resetting device has the advantage that, in each case,only one pin, that is, the shortest and most worn pin, has to bereplaced by a new pin. Afurther setting time reduction thereby isobtained for the perforation punching tools of a rotary press.

While specific embodiments of the invention have been shown anddescribed in detail to illustrate the application of the principles ofthe invention, it will be understood that the invention may be embodiedotherwise without departing from such principles.

What is claimed is:

I. In a rotary printing press having a device, for punching rows ofperforations in continuous paper webs, in the form of rotary punchingtools secured to driving shafts and including a first tool provided withre-adjustable punch pins mounted in a receiving body and a cooperatingsecond tool provided with punch dies, the punch pins being regrindable,by a grinding attachment, to tangency of their working ends with acommon circle concentric with the axis of rotation of the first tool;the improvement comprising, in combination, a pin resetting devicemounted in said receiving body coaxial with the driving shaft of saidfirst tool and acting simultaneously on all of said pins; and actuatingmeans accessible from the printing press exterior operable to actuatesaid resetting device to displace all said pins simultaneously throughequal radial distances.

2. In a rotary printing press, the improvement claimed in claim 1, inwhich said rotary printing press includes a frame; said grindingattachment being mounted on a cross beam of said frame for displacementalong said cross beam; and a cup-shaped grinding wheel on said grindingattachment adjustable to the readjusted pins of said upper tool whilesaid upper tool remains in its working position in the rotary press.

3. In a rotary printing press, the improvement claimed in claim 1, inwhich said receiving body has an externally threaded hub; an internallythreaded gear threadedly engaged with said hub and having an extendedhub portion; a ring mounted on said head portion and having a conicalexternal surface concentric with said hub portion; means restrainingsaid ring against axial displacement along said hub portion; said pinshaving equal lengths and having heads on their inner ends formed withoblique surfaces engageable with said conical surface; springs biasinginner heads of said pins against said conical surface; and a pinionmeshing with said gear and rotatable to actuate said resetting device.

4. In a rotary printing press, the improvement claimed in claim 3, inwhich said pinion is secured to a shaft mounted in said receiving bodyfor rotation and restrained against axial displacement; said pin havingan externally projecting polygonal end constituting said actuatingmeans,

5. In a rotary printing press, the improvement claimed in claim 4,including means engageable with said gear and limiting displacementthereof axially of the hub of said receiving body to limit the pinreadjustment path of said ring having said conical exterior surface.

6. In a rotary printing press, the improvement claimed in claim 5, inwhich said limiting means comprises a stop screw threaded through saidreceiving body to engage said gear and having a lock nut threadedthereon.

7. In a rotary printing press, the improvement claimed in claim 4,including a second pinion meshing with said gear and secured to a shaftrotatably mounted in said receiving body and held against axialdisplacement, the last-named shaft having a polygonal outer end toconstitute an actuating means; said two pins being arranged at locationson said receiving body which are diametrically opposite each other forselective actuation.

8. In a rotary printing press, the improvement claimed in claim 1,including a cover member having a hub secured to the driving shaft ofsaid first tool, a cover flange extending radially from one end of saidhub, and a cylindrical lip extending axially from the outer end of saidradial flange toward the opposite end of said hub; said receivingbodybeing secured to said radial flange; a spiral-shaped disc mounted onsaid hub for rotation thereon and having a hub portion formed as a gear;said pins being mounted in circumferentially spaced radial bores in saidaxially extending cylindrical lip; said spiral-shaped disc having aspiral external periphery with a regular gradient; said pins havingrespective different lengths and being of uniform cross sectionthroughout, with the differences in the length of said pins being equalto each other and corresponding to the circumferential spacings of saidpins and to the gradient of said spiral external periphery of said disc;the inner ends of said pins engaging said spiral-shaped periphery ofsaid disc; and a pinion rotatably mounted in said receiving body andmeshing with said gear to rotate said disc.

9. In a rotary printing press, the improvement claimed in claim 8,including respective clamping devices retaining each pin in itsassociated radial bore; said pinion being secured to a shaft rotatablymounted in said receiving body. and fixed against axial displacementtherein, said shaft constituting actuating means for said disc,

10. In a rotary printing press, the improvement claimed in claim 9, inwhich said flange is formed with respective axially extending bores eachintersecting a pin receiving bore; respective tapered clamping bolts,having oblique surfaces, mounted in said axially extending bores;respective disk springs at the inner ends of said axially extendingbores biasing the associated clamping bolts into wedging clampingrelation with the associated pin; and a respective tap hole at the outerend of and coaxial with axially extending bore to receive aback-pressure screw for threading thereinto to engage the associatedclamping bolt to move the same inwardly against the bias of therespective spring to release the associated pin.

1. In a rotary printing press having a device, for punching rows ofperforations in continuous paper webs, in the form of rotary punchingtools secured to driving shafts and including a first tool provided withre-adjustable punch pins mounted in a receiving body and a cooperatingsecond tool provided with punch dies, the punch pins being regrindable,by a grinding attachment, to tangency of their working ends with acommon circle concentric with the axis of rotation of the first tool;the improvement comprising, in combination, a pin resetting devicemounted in said receiving body coaxial with the driving shaft of saidfirst tool and acting simultaneously on all of said pins; and actuatingmeans accessible from the printing press exterior operable to actuatesaid resetting device to displace all said pins simultaneously throughequal radial distances.
 2. In a rotary printing press, the improvementclaimed in claim 1, in which said rotary printing press includes aframe; said grinding attachment being mounted on a cross beam of saidframe for displacement along said cross beam; and a cup-shaped grindingwheel on said grinding attachment adjustable to the readjusted pins ofsaid upper tool while said upper tool remains in its working position inthe rotary press.
 3. In a rotary printing press, the improvement claimedin claim 1, in which said receiving body has an externally threaded hub;an internally threaded gear threadedly engaged with said hub and havingan extended hub portion; a ring mounted on said head portion and havinga conical external surface concentric with said hub portion; meansrestraining said ring against axial displacement along said hub portion;said pins having equal lengths and having heads on their inner endsformed with oblique surfaces engageable with said conical surface;springs biasing inner heads of said pins against said conical surface;and a pinion meshing with said gear and rotatable to actuate saidresetting device.
 4. In a rotary printing press, the improvement claimedin claim 3, in which said pinion is secured to a shaft mounted in saidreceiving body for rotation and restrained against axial displacement;said pin having an externally projecting poLygonal end constituting saidactuating means.
 5. In a rotary printing press, the improvement claimedin claim 4, including means engageable with said gear and limitingdisplacement thereof axially of the hub of said receiving body to limitthe pin readjustment path of said ring having said conical exteriorsurface.
 6. In a rotary printing press, the improvement claimed in claim5, in which said limiting means comprises a stop screw threaded throughsaid receiving body to engage said gear and having a lock nut threadedthereon.
 7. In a rotary printing press, the improvement claimed in claim4, including a second pinion meshing with said gear and secured to ashaft rotatably mounted in said receiving body and held against axialdisplacement, the last-named shaft having a polygonal outer end toconstitute an actuating means; said two pins being arranged at locationson said receiving body which are diametrically opposite each other forselective actuation.
 8. In a rotary printing press, the improvementclaimed in claim 1, including a cover member having a hub secured to thedriving shaft of said first tool, a cover flange extending radially fromone end of said hub, and a cylindrical lip extending axially from theouter end of said radial flange toward the opposite end of said hub;said receiving body being secured to said radial flange; a spiral-shapeddisc mounted on said hub for rotation thereon and having a hub portionformed as a gear; said pins being mounted in circumferentially spacedradial bores in said axially extending cylindrical lip; saidspiral-shaped disc having a spiral external periphery with a regulargradient; said pins having respective different lengths and being ofuniform cross section throughout, with the differences in the length ofsaid pins being equal to each other and corresponding to thecircumferential spacings of said pins and to the gradient of said spiralexternal periphery of said disc; the inner ends of said pins engagingsaid spiral-shaped periphery of said disc; and a pinion rotatablymounted in said receiving body and meshing with said gear to rotate saiddisc.
 9. In a rotary printing press, the improvement claimed in claim 8,including respective clamping devices retaining each pin in itsassociated radial bore; said pinion being secured to a shaft rotatablymounted in said receiving body and fixed against axial displacementtherein, said shaft constituting actuating means for said disc.
 10. In arotary printing press, the improvement claimed in claim 9, in which saidflange is formed with respective axially extending bores eachintersecting a pin receiving bore; respective tapered clamping bolts,having oblique surfaces, mounted in said axially extending bores;respective disk springs at the inner ends of said axially extendingbores biasing the associated clamping bolts into wedging clampingrelation with the associated pin; and a respective tap hole at the outerend of and coaxial with axially extending bore to receive aback-pressure screw for threading thereinto to engage the associatedclamping bolt to move the same inwardly against the bias of therespective spring to release the associated pin.